4-BIT KA BAND SIGE BICMOS DIGITAL STEP ATTENUATOR

A 1.8V 12-bit 1GS/s SiGe BiCMOS time-interleaved Analog-to-Digital converter

A 9-bit Quadrature Direct Digital Synthesizer Implemented in 0.18- m SiGe BiCMOS Technology

This paper describes a 9-bit 6.2-GHz low power quadrature direct digital synthesizer (DDS) implemented in a 0.18m SiGe BiCMOS technology. With a 9-bit pipeline accumulator and two 8-bit sine-weighted current steering DACs, this DDS is capable of generating quadrature sinusoidal waveforms up to 3.15 GHz with a maximum clock frequency of 6.2 GHz. Packed with more than 13 500 transistors, the quad...

A Q-Band Frequency Synthesizer in 0.13 μm SiGe BiCMOS

In this paper, a 42GHz frequency synthesizer fabricated with 0.13μm SiGe BiCMOS technology is presented, which consists of an integer-N fourth-order type-II phase locked loop (PLL) with a LC tank VCO and a frequency doubler. The core PLL has three-stage current mode logic (CML) and five stage true single phase clock (TSPC) logic in the frequency divider. Meanwhile, a novel balanced common-base ...

24-Bit 5.0 GHz Direct Digital Synthesizer RFIC With Direct Digital Modulations in 0.13 μ m SiGe BiCMOS Technology

This paper presents a 24-bit 5.0 GHz ultrahigh-speed direct digital synthesizer (DDS) with direct digital modulation capabilities used in a pulse compression radar. This design represents the first DDS RFIC in over-GHz output frequency range with direct digital modulation capabilities. It adopts a ROM-less architecture and has the capabilities for direct digital frequency and phase modulation w...

Ka-Band SiGe Receiver Front-End MMIC for Transponder Applications

A fully integrated, front-end Ka-band monolithic microwave integrated circuit (MMIC) was developed that houses an LNA (low noise amplifier) stage, a down-conversion stage, and output buffer amplifiers. The MMIC design employs a two-step quadrature down-conversion architecture, illustrated in the figure, which results in improved quality of the down-converted IF quadrature signals. This is due t...